Olenoides
nevadensis is at once very rare and more spinous than most Cambrian
trilobites, as can be seen by the needle-like axial spines and similar
pygidial spines. While from a formation (Marjam Formation, Milliard
County, Utah) that yields abundant trilobites, you very seldom see
this species. This specimen, at 50 mm, is both large and much better
preserved than most, with the axial spines in high relief.